CVE-2026-34978 · cross-distro fix matrix

CVE-2026-34978: Ariel Silver discovered that CUPS incorrectly handled username comparisons

Affects 4 Linux releases across 50 (distro × package) combinations. First disclosed: 2026-06-08.

Fix per ecosystem

Each block below is a distro release where CVE-2026-34978 has a known fix. Run the listed command on that distro to remediate.

Ubuntu jammy

Source: Ubuntu USN

cups→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y cups
```
cups-bsd→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-bsd
```
cups-client→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-client
```
cups-common→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-common
```
cups-core-drivers→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-core-drivers
```
cups-daemon→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-daemon
```
cups-ipp-utils→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-ipp-utils
```
cups-ppdc→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-ppdc
```
cups-server-common→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-server-common
```
libcups2→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y libcups2
```
libcups2-dev→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y libcups2-dev
```
libcupsimage2→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y libcupsimage2
```
libcupsimage2-dev→ fixed in2.4.1op1-1ubuntu4.20USN-8405-1
```
sudo apt-get install --only-upgrade -y libcupsimage2-dev
```

Ubuntu noble

Source: Ubuntu USN

cups→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y cups
```
cups-bsd→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-bsd
```
cups-client→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-client
```
cups-common→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-common
```
cups-core-drivers→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-core-drivers
```
cups-daemon→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-daemon
```
cups-ipp-utils→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-ipp-utils
```
cups-ppdc→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-ppdc
```
cups-server-common→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y cups-server-common
```
libcups2-dev→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y libcups2-dev
```
libcups2t64→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y libcups2t64
```
libcupsimage2-dev→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y libcupsimage2-dev
```
libcupsimage2t64→ fixed in2.4.7-1.2ubuntu7.13USN-8405-1
```
sudo apt-get install --only-upgrade -y libcupsimage2t64
```

Ubuntu questing

Source: Ubuntu USN

cups→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y cups

cups-bsd→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y cups-bsd

cups-client→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y cups-client

cups-common→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y cups-common

cups-core-drivers→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y cups-core-drivers

cups-daemon→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y cups-daemon

cups-ipp-utils→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y cups-ipp-utils

cups-ppdc→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y cups-ppdc

cups-server-common→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y cups-server-common

libcups2-dev→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y libcups2-dev

libcups2t64→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y libcups2t64

libcupsimage2-dev→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y libcupsimage2-dev

libcupsimage2t64→ fixed in2.4.12-0ubuntu3.9USN-8405-1

sudo apt-get install --only-upgrade -y libcupsimage2t64

Ubuntu resolute

Source: Ubuntu USN

cups→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y cups

cups-bsd→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y cups-bsd

cups-client→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y cups-client

cups-common→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y cups-common

cups-core-drivers→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y cups-core-drivers

cups-daemon→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y cups-daemon

cups-ipp-utils→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y cups-ipp-utils

cups-ppdc→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y cups-ppdc

cups-server-common→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y cups-server-common

libcups2-dev→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y libcups2-dev

libcups2t64→ fixed in2.4.16-1ubuntu1.2USN-8405-1

sudo apt-get install --only-upgrade -y libcups2t64

Are YOU affected by CVE-2026-34978?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

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